I don't know if this is any help but have just checked two spare sender units in my "store " and both have the same stampings on the base. They are 2G 73 03 0 - 8 a bit of a problem with the dash before the 8 it has a dot above and below the line as in ""division" (Can't do it on my keyboard ) Hope I haven't confused you even more.

Ammy thank you for your reply!Today reading the Beta Data book, I've seen this "NOTE" , speaking of oil pump

So, the maximum oil pressure must to be 4,5 to 6 bar; an oil pressure sender with a scale of 0 to 8 bar, will transmit a lower pressure to the gauge on the dashboard..Some friends of Fulvia forums discuss on it, because a dash gauge marked Jaeger or Veglia Borletti, need an oil pressure sender of the same brand, scaled at 0-6 or 0-7 barIf not, the gauge on the dash, with an hot engine, still remain in the first half left of the instrument scaleThe Lancia Thema 8V too, seems to be a oil sender of 0-6 bar..bye